Ok, I replaced the monovalve and NOW nothing is happening when I push the button for heat. By the way thank you to all of your for the monovalve threads. The system was blowing just fine, just blowing cool on the highway now nothing happens when I try to turn on the heat ac etc. I replaced the fuses even though they weren't blown and still nothing. Any ideas? I've searched and searched do you think it's the blower motor? My gut tells me it's electrical since nothing is happening at all when I push a button. Was blowing strong before.